Cylinder grinder



1,667,157 M. c. HUTTO I CYLINDER GRINDER Filed July 18, 1925 April 24, 1928.

fl li mwww z am R m m N I ATTORNEY.

Patented Apr. 24, 1928.

UNITED STATES MARSDEN G. HUTTTO, OF DETROIT, MICHIGAN.

CYLINDER GRINDER.

\ Application filed July 18, 1925. Serial No. 44,444.

vided with a minute adjusting device for accurately grinding cylinders of different sizes.

Another object of the invention is to provide a cylinder grinder which will grind a cylinder truly circular throughout so that the diameter throughout the cylinder is exactly the same.

Another object of the invention is to provide a cylinder grinder comprising a series of three grinding stones having extending pins riding on a pair of cones which may be moved apart or drawn together to expand or contract the stones diametrically, a spring being provided for holding the pins in contact with the cones.

A further object of the invention is to provide a cylinder grinder having a series of grinding stones each provided with a pair of extending pins, the stones and pins being supported in die-cast metal to secure the stone and pins together as a unit.

Another object of the invention is to provide a means for preventing accidental movement of the cones within the tool during the operation of the tool but allowing manualadjustment of the cones for the different grinding operations.

These objects and the several n'ovel features of the invention are hereinafter more fully' described and claimed and the preferred form of construction by which these objects are attained is shown in the accompanying drawings in which- Fig. 1 is a section through a cylinder grinder embodying my invention.

Fig. 2 is a bottom view of the grinder.

Fig. 3 is a section taken on line 33 of Fig. 1. 1

Fig. at is an enlarged section taken on line 4-4 of Fig. l. a

Fig. 5 is a detail of the pin holding spring.

Fig. 6 is a detail of the driving connection to the tool.

As shown in'Fig. l the device comprises a metal body 1 having an aperture 2 there through; slidably mounted in the aperture 2 is a pair of cones 3 and 4, the cone 4 being provided with a key way 5 in which a key 6 seats, the key 6 being secured in the metal body 1. The cone 3 is provided with arecess 7 in which the head 8 of an adjusting screw 9 is positioned and the adjusting screw 9extends through an aperture in the cone 3.

and at the lower end is threaded into an aperture 10 in the cone 4:. A coiled spring 11 is positioned about the adjusting screw 9 within the aperture 2 and tends to separate the two cones 3 and -so that the cones are drawn together against a spring tension; There are three stones provided for the grinder 12, 13 and 14 and each stone is provided with two extending pins 15 and 16 which are inserted through opertures provided therefor in the'body 1 and the ends of the pins are machined to fit the faces of the cones 3 and 4. Each stone is encased in a die-cast metal member 17 which is die-cast onto the stone and the pins 15 and 16 are also securedto the stones by being die-cast in the metal 17. In order to hold the pins. in engagement with the cones 3 and 4 a form of spring must be provided, one type of which is shown in Figs. 1 and 5 consisting of a flat metal spring 18 having a central aperture 19 through which the screws 20 are threaded into the body 1. The ends of these springs 18 engage in notches 21 provided therefor in the pins and tend to force the pins inwardly into engagement with the faces of the respective cones. In order to prevent the bolt 9 from turning in the cone 3 the head 8 of the bolt 9 as shown in Fig. 4 is provided with an aperture and a spring wire 22 extends through this aperture and is provided with oppositely bent ends 23 and 2a which engage against the sides of the recess 7 in the cone 3 and the screw head is provided with a circumferential "groove 25 to allow for contraction of the spring ends 23 and 248 of the spring wire 22, and the recess 7 is pro vided with a beveled edge 26 so that the spring ends may be drawn down readily into the bottom of the recess 7. This construction prevents movement of the adjusting mechanism in case the tool should chatter when grinding out a cylinder having an uneven surface. The tool is driven by a shaft 27 which may be secured in an electric drill and the lower end of the shaft 27 is provided with a ball 28 having two extending pins 29 and 30. This ball is positioned in a recess 31 provided in the body 1 with the pins 29 and engaging in two opposite notches 32 which open into the recess 31 as shown in Figs. 1 and 6. With this arrangement a universal joint is provided so that the grinder may be rotated even though the shaft 27 is not perfectly aligned with the longitudinal axis of the tool.

In operation the tool is inserted in the cylinder to be ground and by turning the screw 9 the cones 3 and 4 are drawn together thus expanding the grinding stones until they touch the inside surface of the cylinder. The electric motor is then started to rotate the tool and the tool is moved longitudinally through the cylinder until it grinds out enough metal to free itself. At this time the ball 28 may be removed from the recess 31 allowing the screw 9 to be again turned up with a screw driver at which time the grinding operation is again continued until thecylinder is ground to the correct size. The stones may be made of a coarse grit for grinding out a quantity of metal and a tool using stones of a fine grit may be used for finishing the grinding and giving a fine polished surface. During the grinding op eration kerosene is squirted on the stones in order to prevent the pores of the stones from becoming clogged with metal particles and the kerosene thus assists in the speed of grinding. With this device and an electric hand drill held in the hands the cylinder block of an internal combustion engine may be ground without removing the block from the automombile chassis.

From the foregoing description it becomes evident that the device is very simple and efficient in operation will not easily get out of order, is composed of few parts anclis of consequent low manufacturing cost and provides a device which accomplishes the objects described.

Having thus fully described my invention its utility and mode of operation, what I claim and desire to secure by Letters Patent 1s-- 1. On a grinding tool, an apertured body member, a pair of cones therein, a rod on which the cones are mounted in spaced relation, said rod being threaded at one end and provided with a head at the other, one of said cones being threaded to receive the threaded end of the rod, means for preventing rotation of the threaded cone relative to the rod, the other of said cones being free to turn on the rod, said last named cone having a recess in its larger end for the meme? head of the rod, a friction device for preventing the relative turning of the rod and said last named cone consisting of a spring wire extending through an aperture of the said head and having its free ends engaging the side wall of the recess, and a spring between the cones tending. to move the free cone to maintain the head and spring in position in the recess therein.

2. In a cylinder grinder, a body member having a longitudinal aperture, a pair of cones, a rod on which the cones are mounted in spaced relation, one end of the rod being threaded and one of the said cones being threaded to receive the same, the other of the said cones being slidable and rotatable on the rod and having a recess at its outer end to receive the head of the rod, spring locking means carried by the bolt and tending to prevent relative rotation of the cone and the rod, and a spring between the cones tending. to hold the loose cone in position with the head of the rod, and locking means in the said recess.

3. In a cylinder grinder, a body member having a longitudinal aperture, a pair of cones therein. a rod on which the cones are mounted in spaced relation with the small ends thereof in opposed relation. one end of the said rod bein; threaded and one of the cones being threaded to receive the same, the other end of the rod being provided with the head and the other of the said cones being slidable and rotatable on the rod and provided with a recess at its outer end to receive said head, a spring between the said cone members tending to hold the loose cone against the head of the rod with the head in the said recess, a friction device connected with the rod engaging the wall of the recess tending to prevent relative rotation of the loose cone and the rod, and the cones and rod being movable as a unit in said aperture, and a series of abrasive members supported in the said head each having parts engaging the respective cones whereby pressure on the abrasive devices tends to spread the cones and in addition to the said spring holds the said head and friction means in the recess of the loose cone.

In testimony whereof I slgn this specification.

MARSDEN C. HUTTO.

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